Courses of all categories are displayed on single course category pages

I have 3 categories on my site and 10 courses on it. Category one has 1 course, category 2 has 5 courses and category 3 has 4 courses but for some reason when I visit /course_category/category01 or any of the other course_category pages all my courses are listed on it, not sure why. There should be only listed the courses from the selected category.

I tried running a plugin/theme conflict test and the issue is still there. How can I fix this?